# Mega Menu

> Stripe-style navigation with one shared dropdown surface that resizes and slides between panels instead of closing and reopening; panel contents cross-fade in the direction you moved.

- Slug: `mega-menu`
- Category: [Navigation](https://www.assembli.design/category/navigation.md)
- Type: block
- Tags: mega-menu, dropdown, navbar, morph
- npm dependencies: motion, lucide-react
- shadcn/ui dependencies: none
- Added: 2026-10-15
- Live preview: https://www.assembli.design/preview/mega-menu
- Page: https://www.assembli.design/components/mega-menu

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/mega-menu/mega-menu.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/mega-menu
```

Registry item JSON: https://www.assembli.design/r/mega-menu.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.